Drawworks control apparatus

Details Drawworks control apparatus Drawworks control apparatus

1975-12-08

1977-09-06

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

254172, B66D 148

Patent

active

040463559

ABSTRACT:
A control apparatus for use with a drawworks assembly having a work piece suspended from, and applying tension to, a cable, one end of the cable being wound on a drum, the rotation of which is controlled by a power brake mechanism, the control apparatus comprising a cable tension sensor producing a tension signal proportional to the tension in the cable, a pulse generator producing a pulsed control signal and a brake control applying the tension signal to the power brake mechanism in response to the control signal.

REFERENCES:
patent: 2867411 (1959-01-01), Simmonds et al.
patent: 2931628 (1960-04-01), Simmonds et al.
patent: 3104864 (1963-09-01), Melton et al.
patent: 3461978 (1969-08-01), Whittle
patent: 3759489 (1973-09-01), Jones
patent: 3833270 (1974-09-01), Gotz et al.
patent: 3874741 (1975-04-01), Schnaibel et al.

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